Live channel pause - resume functionality

[ChernyshovYuriy]

Dear colleagues,

I decided to file a separate issue regarding functionality of Pause and Resume Live channel. Behaviour is not consistent and could not be fit into this issue only.

Here are two links of the public streams provided by NASA (it is public):
http://nasatv-lh.akamaihd.net/i/NASA_101@319270/master.m3u8
http://nasatv-lh.akamaihd.net/i/NASA_103@319271/master.m3u8

Using the latest version of ExoPlayer, which is 2.1.1, and by pausing and resuming after a wild there are different behaviour of the ExoPlayer. Depends on how long pause was, there could be InvalidResponseCodeException, BehindLiveWindowException, or player can stack on the buffering state. These are I discovered so far.

Issue can be reproducible by current version just by providing specified URLs in the "media.exolist.json" (in the "HLS" node).

Expected behaviour for the Live stream is to fetch the latest playlist as soon as Resume. Or, at least to play out buffered chunks and fetch the latest playlist.

[ChernyshovYuriy]

Thanks for fixing this.
Unfortunately, I can not provide any live channels for DASH.
Would be good, if you guys have some Live DASH examples, to test it as well because I am experiencing BehindLiveWindow exception when pause in and resume channel after a wild.

Thanks.